CVE-2017-18186

An issue was discovered in QPDF before 7.0.0. There is an infinite loop due to looping xref...

5.5 MediumFix available

An issue was discovered in QPDF before 7.0.0. There is an infinite loop due to looping xref tables in QPDF.cc.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: None
User interaction: Required

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

1.12%Up 0.3 points since Apr 14, 2021

What each source reports

NVD Score used 5.5

An issue was discovered in QPDF before 7.0.0. There is an infinite loop due to looping xref tables in QPDF.cc.

Record: CVE-2017-18186
CVSS 3.0: 5.5 MediumCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CVSS 2.0: 4.3 MediumAV:N/AC:M/Au:N/C:N/I:N/A:P
Weakness: CWE-835
Updated: 2026-11-02

CVE List No score

An issue was discovered in QPDF before 7.0.0. There is an infinite loop due to looping xref tables in QPDF.cc.

Record: CVE-2017-18186
Updated: 2026-11-02

EUVDEUVD-2017-9321 No score

An issue was discovered in QPDF before 7.0.0. There is an infinite loop due to looping xref tables in QPDF.cc.

Record: EUVD-2017-9321
Updated: 2026-11-03

GitHub AdvisoriesGHSA-v5gm-hmrc-rgfq 5.5

An issue was discovered in QPDF before 7.0.0. There is an infinite loop due to looping xref...

An issue was discovered in QPDF before 7.0.0. There is an infinite loop due to looping xref tables in QPDF.cc.

Record: GHSA-v5gm-hmrc-rgfq
CVSS 3.0: 5.5 MediumCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness: CWE-835
Updated: 2026-11-02

OSV 5.5

An issue was discovered in QPDF before 7.0.0. There is an infinite loop due to looping xref tables in QPDF.cc.

Record: CVE-2017-18186
CVSS 3.0: 5.5 MediumCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2017-18186 5.5

An issue was discovered in QPDF before 7.0.0. There is an infinite loop due to looping xref tables in QPDF.cc.

Record: DEBIAN-CVE-2017-18186
CVSS 3.0: 5.5 MediumCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2017-18186 5.5

An issue was discovered in QPDF before 7.0.0. There is an infinite loop due to looping xref tables in QPDF.cc.

Record: UBUNTU-CVE-2017-18186
CVSS 3.0: 5.5 MediumCVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUSN-3638-1 No score

qpdf vulnerabilities

It was discovered that QPDF incorrectly handled certain malformed files. A remote attacker could use this issue to cause QPDF to crash, resulting in a denial of service, or possibly execute arbitrary code.

Record: USN-3638-1
Updated: 2026-11-02

Affected products

qpdf project qpdf

Affected packages

Affected packages
Package	Affected	Fixed
`qpdf` Debian:12	before 7.0.0-1	7.0.0-1
`qpdf` Debian:13	before 7.0.0-1	7.0.0-1
`qpdf` Debian:14	before 7.0.0-1	7.0.0-1
`qpdf` Ubuntu:14.04:LTS	before 8.0.2-3~14.04.1, plus listed versions 4.2.0-25.0.1-15.0.1-1ubuntu15.1.0-15.1.1-1	8.0.2-3~14.04.1
`qpdf` Ubuntu:16.04:LTS	before 8.0.2-3~16.04.1, plus listed versions 5.1.3-25.1.3-35.2.0-15.2.0-26.0.0-2	8.0.2-3~16.04.1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2017-18186 is a medium vulnerability (CVSS 5.5) in Qpdf Project Qpdf, published February 13, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.12%, the 66th percentile. Fixed in qpdf 7.0.0-1.

References

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